Could you remind me how the Trinity works? And could you explain to me again this idea of grace?" One diligent student had no problem grasping Islam. She had no problem understanding religions based on a concept of exchange—do something for a god and he'll do something for you. But she was legitimately confused about Christianity: "The Quran is simple. Why is Christianity complicated?" http://www.worldmag.com/articles/17907Christianity is complicated because reality is complicated. Show me a simple religion, and I’ll show you one that is not real.
"Reality, in fact, is always something you couldn't have guessed. That's one of the reasons I believe Christianity. It's a religion you couldn't have guessed."
--The Case for Christianity
Christianity tells us what man-made religions like Islam or Hinduism do not: That at a specific historical moment God experienced intimately torture, abandonment, overwhelming loss, and unjust death. http://www.worldmag.com/articles/17907Factoid: Jesus is asked 183 questions in the Gospels. He answers just three of them—and he asks 307 questions back. http://www.worldmag.com/articles/17907